function roll_over(img_name, img_src)
{
   document[img_name].src = img_src;
}

function random_imglink()
{
  var myimages=new Array()
  //specify random images below. You can have as many as you wish
  myimages[1] = 'images/image01.jpg'
  myimages[2] = 'images/image02.jpg'
  myimages[3] = 'images/image03.jpg'
  myimages[2] = 'images/image04.jpg'
  myimages[3] = 'images/image05.jpg'

  var ry=Math.floor(Math.random()*myimages.length)

  if (ry==0)
     ry=1
     document.write('<img src="'+myimages[ry]+'" border=0 width=658 height=345>')
}